Synaesthesia is a rare neurological condition whereby stimulation of one sensory or cognitive pathway (such as sound) leads to involuntary experiences in a second sensory or cognitive pathway (like sight or taste). This allows certain people (called synaethetes) to see music, or associate personalities with numbers, letters, days, and months. The video above (from The Guardian) explains how one woman can taste music, and what the Imperial March from Star Wars would taste like. Not good, apparently!
I don’t have any form of synaesthesia, but I think it would be fantastic to experience it! Onwards!